Better Farming Series 31. Biogas: What it is; How it is Made; How to Use it (FAO Better Farming Series, 1984)

(introduction...)

Preface

Introduction

How to build a small biogas unit

Waste materials

Time

Cold weather protection

Stirring the waste mixture

When the gas is made

Using your biogas

Using the fertilizer

Taking care of your biogas unit

Making more biogas

Using the fertilizer

115. You have already learned that when all the gas has been made,
the material that is left in your biogas unit is a very rich fertilizer.

116. It does not have a bad smell, and the parasites that were in
the animal wastes and the weed seeds that were in the plant wastes are no longer
harmful.117. You can spread this new fertilizer on your fields to help your
plants grow well.

Put fertilizer everywhere

118. Do not put the fertilizer all in one place. Put a little of
it everywhere on your fields. In this way, all of your plants will grow
better.